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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b18bd0480959755cf703e1f8b465b99d325113422e9d66114d882aa81ec073' 
  AND token = 'hw5wj1Mv4bTB4OedhHWk9aTsg5l+iT6IDDd/Z7dbh4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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