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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d395c2d6a25c78fbfea41ee80aac3b4dc9486ce66240626da9cfc1585e63fde' 
  AND token = 'SNQTuLaz69ZLn+02f6m3LolXbndR6m6QjoRYWX1dE2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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