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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad0f075a57e127d8e5463f76467254b133e94ab67245d2d10bee1ef1a538c94' 
  AND token = 'WWk0L1wwDAHsN2sL1bvhiR5fuU5t8FjzS6+U79Rfza0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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