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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd383168b59fd594d552b6f9c68f21fc81bc750c51a356c97a7d80bf5ca85e0b' 
  AND token = '8MbbiAQwXUNraoShLDjCZ6OTJfBtM5ql4aorkuE3W24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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