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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '743fdacf899b714452bd7c2f488b7410829dc8cf7727c2b90e2a0fd28fd58259' 
  AND token = '+tX3pezud9Jv2VyAX9Mzs7rtnEje2NwQLzEXwPnS9Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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