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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56752dc3fb2c97056a4da88ac23d2d663ca6d630bb1cba5bd1014ff97ec27a22' 
  AND token = 'a01X83Hhf7V9TN5gCfmeSOKtrH/dTi5+h2lDY1NOMW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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