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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2363c956448ce800b863668896f35626a83351813f7ede4b76828a3fa90728' 
  AND token = 'kao6ZQoBP5IPbeYUWIPZVuLq68QGqu9YvAdMdRg7CLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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