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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42dd94d2531394403c7900d762e60cea94afdccbb630ce343fa1f1f8161fa88' 
  AND token = 'd06kwraa605j2Nf94uUK8rWMQPrAe9EyPl/KKjFtwqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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