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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef032368718ee5095d9d6f1a04fd50c28b3d40271ffa73711c1ddf875632dfd' 
  AND token = 'MT1lu41pNylSriyfP9iwN1y4fFJdJo5tmsDKhzww3DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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