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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8021905bd6a448bb6b34f30a567f23586fa6b6f887d00d6ff01ed4dc2605f5fb' 
  AND token = 's8U8gFaQRUoY8jo57oSzirB1W264iUXy6Dxl7g3sJ9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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