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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81b6017e74285c2a3c54dc26815d70c4eb88890a81cea862b8046e1a5649551' 
  AND token = 'WAw+lpfZkP3UmhZwOJ0XkXs5Nq85wSkXi0zptR1VSqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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