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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e207a7767aa60470c0b2ac6e82cfcd1fc0a64e594eb3e39d2eb495450330e6ac' 
  AND token = 'kqBw/QJh/fFPxdhHrns6lDj+trWzxkN4hv6VbE44NBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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