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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd280bfa61873e88e487caf854b2613955897ce0c4a6544ca1397990fe18fe95e' 
  AND token = 'tv3Wi0SyrFDjC+XAuVsrC0rtXhYwENUeWGCdvhsN86U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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