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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c0352094e73b9bc87f4e1e0245c0333dd481bc424988282b30fb91751855c1' 
  AND token = '7K874l4ks3M2UOOw2zCiPwb9ZLRIima6Py61R/nMbOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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