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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491b355fb12046ece2ba7af105de8b21b25c98b5296af7f71186f8f602d28aba' 
  AND token = 'o1+D1JSmaWmpGPR66yOh4o5mD2UO90o6DiUYuw1gKy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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