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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892d3b32959b7b762a6c98b2115f705ed57fa0e6e1d1d98932e1b53829697001' 
  AND token = '04dOMxnRNogWsLrxvfU2SLdPvQpqu87X7xReH80a5Oc=' 
  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"
    }
  }
}