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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf85d7d7cc3c6a04d86d9c579c76ebf1fecf4f5bb1b7ce9c9c717b45fd9b7e24' 
  AND token = 'v+f/Vg3sKmOiaT0w7/55rB1jC5oUgToIzl/wrZVCBbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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