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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8211a0278cde0060ca987c7fa9c90667705cd27be2c8c2ed4f1ad35d7708b911' 
  AND token = 'AjqOV23lBP5bBrFcQbGcKa4aN9XFEy4Hv7DSAXL7FyA=' 
  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"
    }
  }
}