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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57eaa449f673ec761326e58dd49332faa0886ab75e3084cb19931a39fb4773b' 
  AND token = 'lGI8oYc5rTCdX1hQG6rXo5ZMvTE7t8hgDrKxyTpgml4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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