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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96810a68d3bcc803ac501a566d88cd9aa82d5bab86ec33eadc674d3fab3cd1c0' 
  AND token = 'n1JKAEHa2fLonrTszQm+8MXEeK6vBU0J6FVOOo34c64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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