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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d9f033f67408e9f6e0e215f56dd40d214f06b04447cf9b4b7a55219b8f9049' 
  AND token = 'ZWAll2eF+LmPEwNOn83Ppbz0fBjpmhyNlzJx8T7mKTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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