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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd964faa530b73d6bce05057d91a10d54cdfc96c62a8130c68930bc9b0cfd62f7' 
  AND token = 'KGh4AmnI+zwh3UHND5+Zz7POOA5SaG9MNJ5gRlaFmHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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