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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c39efbc97364cd24bc8d49a6ff4528061736d5806906a2745b6a4d195d12370' 
  AND token = 'zkRI2SWC67LupAjsinZUije0/nGRkOueg5DfY8S1jXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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