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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e627af87f0b1cffa8f645903e2db173696d7a1133ab0cd6b6b5bb745872a7b2' 
  AND token = 'yZdRr0Ff3kimW3GWLOV+HxTFZF5cKBzwetieLw8IoqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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