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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6946eac726efe946de696265fba6297cff804396655d28c64e3ccf35c0343e' 
  AND token = 'aV90x2NXhUSRSnrUkplawGi8Iu5spbDR+FxgDSxAE/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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