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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6017095e7c774c2255bdfbfd160e703fee2cf5d7974fce3c48654d4959f957b3' 
  AND token = '3cZ52LWj+E8BagkKENTY6Q2TUpE9mZPJKRPwt7/NRVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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