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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a121602637ac7b5dbc0eac62bbe5ce24969214fa7b9fa378cd75cb44903226ce' 
  AND token = '+yUCjJzdo+nAAOyE7SOGti6kB6SWy/Lf83jdmiS5BGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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