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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0fd83968d1f6aff41323bda8cf86e2003e7372c832cdcdf7802c9ff8d791a5' 
  AND token = 'Akk5ezvI7euXbEXyWKwkmyvrljYa/xUWtkYnIG0W160=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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