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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6274c159552306d860fc9b36324db726d62ff0add40ffefec92bf3822463d4' 
  AND token = 'kZfhj8JTswAP1WJ52c0nVGc1eO/AZZUsSq8eZ0zySYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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