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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532846f257a45600ba95dde2eb6503c5fcbc49890c7fdeca75f1f9a7df79badf' 
  AND token = '0zx47mn2pZdOL6lXrYhEgjV+n47eK1vBeSkMKWebtxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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