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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a227df8f15ea7792a17e86b9e957cf431892ce3a4aff9c9ff62a2b148f1d209' 
  AND token = '12WORj2EC8AKahOeQ31tic1mrT3nZd7KIRwSBrz/nyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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