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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cf141f6104abcb52237e1de6d431ecc0b8b6d339fc6175c37f8ca21032b594' 
  AND token = 'eXI70kqYNfy1tHzTSXSyAYZvbDksHg2+OTgzLhw/eK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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