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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4eab14e3aef39a2e0481d78a74ac5e36f3adb90fd95c7b5d7b201d08a6d922b' 
  AND token = '+WRgkru5U2n1klpuB8HIj2GAzsFPhSdTIdftjZ0Xzr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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