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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f74fabd7e7f0eea30b8bb14aa0cdc519a6324057d64bc34a5ee5dc6ab675f06' 
  AND token = 'YNv/spA8COPX8nuTla+Thb7X0Bg29CoSDAqnHtaKVz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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