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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37459e29c3ac7cf2a8f8899f74fbb22347b4ebc5ed2ef43c7310a2a85b52799' 
  AND token = 'HmBID7Rb9IivobFlHQKM/bVvU2N3vu6Xth3Mph2n+Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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