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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2bfee64fd99c01bddba8d436e387c27553fbb6eab2949dc5c6e85ff8ccaa26' 
  AND token = 'krNAJYCB9qIbEj7p3WpaiSP4D6bJPM3JypE8lawiynM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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