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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53a4da4a9ae14393fcfdd0ffe4a10554bbb7352ef262a75c9f2e80eab3af62c7' 
  AND token = 'pif4gbIBqF/91PCClC03+S8d554z3CE9H9h/zmShod0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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