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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d7ab4158b648e94f6ca6883271c18b46000b638d1e25ff42fbb4b80d362aea' 
  AND token = 'PFS0YTXNebMpCmB4yl+J85TwGdEDPp/HET2wAt8tRbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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