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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b9fa713945aba38de7f310e6f8e017b80ea0c10dd98928ba5fdf7928df6ab3' 
  AND token = 'x3W97wadyidWHM9Q+L62ZYVahjMWa5qa87IYFoAluFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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