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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0395e7fcc2fdf54a25cb119376aff72a0ce25285589ca70d58cf93f72ea0fe04' 
  AND token = 'gvDk8Et4d08/Zh4NYBGFwxsPa3nZD0rI4pspwFic3Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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