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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac943eabe510499be48c23c24f6b94a1829c6dc0edbcb10b2814c7f1018f1d1' 
  AND token = 'zyYLA0yZGowWeuZ0lG36Tnnhds3IRZblTK6HFP5qEcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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