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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bab27d5bb247866a8a188a9a01898f8649594ec32ac0a1cb22258f6f5666a5b' 
  AND token = 'M1vpH/Xwlwq98r6TQpFCViZaDd9lt2TyFCQuTpTRJis=' 
  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"
    }
  }
}