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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a32dc32e2f2478d42d84cfe6ba628ea787a2b96c0ed5bafb4f7889b7b1bc19' 
  AND token = 'J8WiPXU9iWZibV+jTLTOuH8PQpI3PCp8vUq15FqEo/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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