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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f379c79b67c3562f5c2c00169a7ef0d8c8a073a0e547468fb6597babc6aded66' 
  AND token = 'CBTo83+0NXT88N8TEANAs+8onUDYQ3rM8C8JlWw3Wu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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