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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd74ca79f11d73df405ab75d745607664a6d204ea369a0ba259df6f7f90fb1a47' 
  AND token = 'CxcGKj4BT+zmJwmnJKvQY+pQY19kp0OmVxeNieIHKkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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