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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda7a78c5d6e4a3b861305a01c20be2c490ebd3f55d5bb71ec3c1e52892f5821' 
  AND token = 'iFXw5H3EvBXlaj5Vgcv9n9VSpGGLflrIwFpv8/nxSmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}