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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5382305d32ed2e37a9c60bb7860f0401b52df9bbf51a20eb3bcd3486d4dad0b5' 
  AND token = 'gjuYaEly3ifyhjTK5r5/kag/O4Kr6p3xtbgoUrmyehs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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