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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0188db61cc250559eb276fd91a16a3d54361a4e140876aa12358a48ead9f8d01' 
  AND token = 'bxUQ0Zp7zgDxutCoSH4z34LLa6e9UJ+L+xNH9h8xrTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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