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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ef3deb10b7f6c6de0a0b5c23bca8f01a85d1094b221b5b9447e7617c25d8f4' 
  AND token = 'bfV7iCr26NZgHAqJrYsCa8twIyNo1zbrcKh05zZJBiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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