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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72062aaa898a8ac980825f03552082e61375d9fb6c8e8b3d5d3f79f3ed9116e2' 
  AND token = '4y+D6NO+FHy/BpmBo3QlQSKL4fjQ+RLmzRPeSc0jGzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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