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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16277b78f6c47f3d293d62363a9eca6220b485d0f572807a8251f0634ea61f88' 
  AND token = 'T7NjIUQTCZzPHPQH1rdX4vMe9hgms1kVOckFfS33lSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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