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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ddee7f4ceb5c33ba12da4e1140f70b9c9bd711f9fb390f8bae9858eae30dbe1' 
  AND token = 'cUZb+f8xwQcZ7uu41XpfMp/ytOLLKa2u3dPIYaXit2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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