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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13e31a6432c97e2dc2f5dc43b6e96e399faf38273e69d3c95f66538eb672694' 
  AND token = 'Rbc/R63CUdB2yPeLg3jBU7NI5Y9kp6/fY/PW7idULlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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