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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3495b870999c02d9203c3f19e6cb8959a48ca94d2b843bf6c6d7184114f5be1f' 
  AND token = 'dHXPChW798M8M5dmxVXt8EylWQ+Y+1FJ9/7x7TPbLVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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