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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692f25c45a679bff1b289adb2219eba6625ac10b7e49c6ad492826e017ab2534' 
  AND token = 'Gzr9bvP2DwU8HdTaY1FYCKB4P2daRp1WBGZJMy485ng=' 
  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"
    }
  }
}