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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '749900f1634189426791ad3d4e25e61c62d5b2354fe83e884b34f8b1e76acc5f' 
  AND token = '16FfJ8XKIOurcIwTGO487a5QavtTz7BWJmETyfrKXJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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