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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5f544345e4fd47ab8cad8489a9ea53adc56bc0193f8f2dc5ca5f85126c7688' 
  AND token = 'tTMlOf0D7AQDMLQyNVFMNSyVUym9JFAmt3DMFWDrTa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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