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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f5e924ebf47c382cc31a0e4c2163cde5deda8ec999f7076d1536aff303c578' 
  AND token = 'aLNW6egOizZkaK9NgILzfAh9b4sYigy7/W4V2WfUWiw=' 
  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"
    }
  }
}