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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c6a9b9c446bf15eaa8bbb79570527abfa79987ba71268ce79ca85f2c35be41' 
  AND token = 'glkNMa2Ugq6O/lMowv0XVs6dDa3wV8yO+aEMdSWn/+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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