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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e996a186e6e9428172818a0238026fb1fa2199dbefac58f4b2606b6cee50b9c5' 
  AND token = '3UKFCTa4TZtsnI86wg72ug/V5y7Ddts+6qTMobrWTkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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