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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403790eaea6a50b07f71be5f1683bb7a4284bad640028dca9d4e89170bc36321' 
  AND token = 'Kc8NL88kZrnplLGrsm+xdyEqMhX5RT3+ABuTtglOppQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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